Well, the Quicksand in Ul'dah is where most people tend to go, but that being said it's usually incredibly crowded. There are a few LSes built for people looking for rp connections as well, if you'd rather try that method instead. (I actually run one but I'm on Balmung myself.) Any of the adventurer's guilds though, including Limsa and Gridania, tend to have rpers in them almost all of the time.
Edit: I replied at first not seeing this was on Gilgamesh so forgive me if my info isn't 100% accurate for your server. Blame 2am posting ^_^;;
Edit: I replied at first not seeing this was on Gilgamesh so forgive me if my info isn't 100% accurate for your server. Blame 2am posting ^_^;;